Help needed, example (serial port) streams module not working.

Question

I am trying to make work the tblt.c example of a streams module on Solaris 8.
This sample is the one provided by Sun in it's Driver Dev. Kit.
My test program gets blocked in the I_PUSH ioctl (after having successfully
poped ttcompat and ldterm).
Debug prints in the module tell me that the tbltopen() stays in the loop
     * Now wait for it. Let our read queue put routine wake us up
     * when it arrives.
     while (tbltd->tbltd_flags & TBLT_IOCWAIT) {
          if (!qwait_sig(q)) {
               lwp_error = EINTR;
               goto error;
done, after
iocb = (struct iocblk *)mp->b_wptr;
     iocb->ioc_count = sizeof (struct iocblk);
     cb = (struct termios *)datap->b_wptr;
     cb->c_iflag = 0;
     cb->c_oflag = 0;
     cb->c_cflag = CREAD|CS8|B9600;
     cb->c_lflag = 0;
     bzero((caddr_t)cb->c_cc, NCCS);
     datap->b_wptr += sizeof (*cb)/(sizeof (*datap->b_wptr));
     mp->b_cont = datap;
     tbltd->tbltd_flags |= TBLT_IOCWAIT;     /* indicate that we're */
     tbltd->tbltd_iocid = iocb->ioc_id;     /* waiting for this response */
     (void) putnext(WR(q), mp);
(used to set baudrate, I suppose)
and only a Ctlr-C of my test prog. makes it return via
lwp_error = EINTR;
               goto error;
A few years ago, I had no trouble with the same Solaris 5 example.
and my hardware (tablet + cable) works fine on a Solaris 5 system.

Answer 1

darren,
thanks for your help here and over on comp.sys.solaris. ultimately the problem was portmon on ttya, and i think i know how it happened. the machine was set up with a keyboard and monitor, and ttya was enabled using admintool. later, with the machine headless, the console was changed over to ttya via eeprom, which produced the conflict i noted above.
solution:
# pmadm -l
PMTAG PMTYPE SVCTAG FLGS ID <PMSPECIFIC>
zsmon ttymon ttyb u root /dev/term/b I - /usr/
bin/login - 9600 ldterm,ttcompat ttyb login: - tvi925 y #
zsmon ttymon ttya u root /dev/term/a - - /usr/
bin/login - 9600 ldterm,ttcompat neo ttya login: - vt100 y #Terminal
# pmadm -d -p zsmon -s ttya
# pmadm -l
PMTAG PMTYPE SVCTAG FLGS ID <PMSPECIFIC>
zsmon ttymon ttyb u root /dev/term/b I - /usr/
bin/login - 9600 ldterm,ttcompat ttyb login: - tvi925 y #
zsmon ttymon ttya ux root /dev/term/a - - /usr/
bin/login - 9600 ldterm,ttcompat neo ttya login: - vt100 y #Terminal
# echo $TERM
sun-color
# svccfg
svc:> select system/console-login
svc:/system/console-login> setprop ttymon/terminal_type = "vt100"
svc:/system/console-login> exit
# echo $TERM
vt100
also see
http://www.bordergatewayprotocol.net/jon/helpful_stuff/solaris/solaris-advanced-sysadmin-guide/ch09/181-186.html